9.

A random sample of 79 companies from the Forbes 500 list (which actually consists of nearly 800 companies) was selected, and the relationship between sales (in hundreds of thousands of dollars) and profits (in hundreds of thousands of dollars) was investigated by regression. The following results were obtained from statistical software.

R²= 0.662

s= 466.2

Variable

Parameter estimate

Standard error

Constant	176.644	61.16
Sales	0.092498	0.0075

What is approximately the value of the intercept of the least-squares regression line?
	0.0925 0.0075 176.64 61.16

What is an approximate 90% confidence interval for the slope₁?

0.09 0.0125

0.09 0.0125

0.09 0.0075

0.09 0.0075